Siren.



H. HECHT.

SIREN.

1 APPLICATION FILED JULY 25, 1911. l,l43,389 Patented June 15, 1915.

E Z-- O Q e V 2 THF MORRIS PETERS Ca, PHOTDJJTHGA. WASHINGTON. a C.

Y HnINItIcH Hncrrr, or KIEL, GERMANY.

SIREN.

Specification of Letters Patent.

Patented June 15, 1915.

Application flied July 25, 1911. serial No. 640,467.

T0 all whom t mag/concern Be it known that l, Dr. HEINRICH HEGHT, a subject of the German Emperor, residing at 62 l-loltenauerstrasse, Kiel, Germany, have invented certain new and useful Improvements in Sirens; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as `will enable others skilled in the art to which it appertains to make and use the same.

My vpresent invention refers to means for submarine signaling by sound and more especially by sound produced -by means of a siren.

lt is knownthat a siren'constructed substantially in the well known manner can be used to produce sound in water or any other liquid medium if, instead of operating the Y ysiren .with a gaseous fluidsuch as steam or compressed air, it is operated by a liquid medium such as water.

For the purpose of signaling it is-desirable to cut off and start thesound of the siren very-abruptly and with sirens operated by a gaseous medium theusual means employed for this purpose consist in driving the rotor of the siren by a motorproducing constant rotationand `providing a slidel valve adapted to cover'and close the sound apertures of sirenwhengshifted 'from one position to another.` .Byoperatingthe slide by hand or power signals of theuMorse Vcode type oraccording to any other similar code' can be transmitted.

ln applying this system to a siren operated with a liquid medium, ksuch as water under pressure, a serious diiiiculty is encountered.. It is found that to make a slide easily movable under the pressure required for satisfactory operation and at the `same time to make it sufficiently watertight to obviate leakage eii'ectually, under ordinary conditions would require very superior workmanship and that even if a satisfactory fit is produced, a slide valve of this descripby which the pressure of the water ernployed for operating the sirenis itself utilized to press the slide onto its seat and thereby to" produce a perfectly watertight fit irrespectively of any degree of looseness or play `that maybe initially given to the slide. Moreover by this means the pressureby which the slide is applied to its seat automatically varies according to the water pressure employed in every individual case and correspondingly the friction of the slide resisting its operation is regulated to suit the case, that is to say, it is diminished when the water pressure is reduced as for instance in signaling over small distances.

Sirensv as heretofore 'constructed' are usually built according to two different types namely either in the shape of a disk having apertures disposed along its periphery and journaled to rotate face to-face with a similar stationary disk or else in the shape of a perforated drum adapted to rotate in a stationary cylindrical casing part of the wall of which is correspondingly perforated.

My invention more especially refers to sirens of the latter description and if so applied can preferably be reduced to practice by providing a slide in the shape of a cylinder surrounding the whole circumference of the stationary casing vand furnishing openings at the back side of the casing or stator, through which the pressure in the interior of the drum acts to press the slide against its seat.

In the accompanying drawings I illustrate what l believe to be the best means for putting my invention into practice.

In the drawing Figure l is a longitudinal section through ardruin siren arranged according to my invention and Fig. 2 is across section on line 9.-2 of Fig. 1 with theslide in closed position. j A

In all figures, R is the rotor, S the stator andV the slide valve of a drum siren.

G is a casing which surrounds the stator except for about a quadrant and opposite this quadrant sound outlet holes O are arranged in the stator S. Y

YV is a driving shaft, which may be considered coupled with an electric or other suitable motor not shown.

l) is a iiange adapted'to receive the end `of apipelikewise not shown through which water under pressure isled to the interior fof the rotor R. The preferred direction of the flow of the water during the operation .0f the Siren isshown by the arrow in Fig. 1.

If only the apertures O were provided in the stator on the side ofthe outlet opening of casing Gr, and if it is assumed that the slide V has a certain amount of play between the casing G and the stator, the distance between the stator and the slide would be increased by the pressure of the water and the openings O could not be closed so as to be water tight.

According to the present invention an opening Ol is arranged opposite the sound outlet holes in the stator. Therwater pressure then also acts through this opening on the side of the slide opposite to the Vsound openings and as the sleeve is closed on this side, while the pressure is relieved from the opposite side by the sound apertures, the slide is pressed against the stator at the part registering with the openings O and the greater the pressure of the water, the more effective is the closure.

This effect is the saine whether the slide is moved circuinferentially or axially. The circumferential displacement is shown in thepresent instance, because it can be illustra-ted more conveniently by a cross sectional view.

Forthe purpose of operating the slide an Yextension E may be provided on the rear side of the casing G and an arm A may be secured to the slide V. A slot in the end of `V is 'shifted from 'the position shown in the drawing, in which the apertures at the `frontsideregis'ter withfull portions of the stator wall between the soundopenings O to a position Vin which the apertures in the slide register with the sound apertures in the stator'.

Having now particularly described and ascertained the nature of my said invention and in what mannerl the same is to be performed, I declare that what I claim is z- 1. A'siren adapted to employ a liquid as the sound-producing medium, having a partition with sound orifices, a cut-oil slide movable on said partition to cover and uncover the orilices, the said siren having liquid passages through which the pressure of the liquid in the siren is applied tothe slide to press it toward the partition when the slide covers the orifices.

2. A siren-adapted to employ a liquid as the sound-producing medium, having aurotor and a stator provided with sound ori- "fices, a cut-off slide movable-on said stator to cover and uncover the orifices therein, the said siren having a liquid passage through which the pressure of the liquid in the siren is applied to the slide to press it toward the stator when the slide covers the orifices.

3. A siren adapted to employ a liquid as the soundproducing medium, having a cylindrical rotor apertured to permit the iow of liquid therethrough, Vand a cylindrical statorcorrespondingly apertured at one side of its periphery and having a pressure aperture on the other side ofV its periphery, and a Vcylindrical cut-oil slide surrounding the stator and having apertures adapted to registervwith the rotor and stator apertures, whereby the pressure of the liquid Vin the siren acts through the pressure aperture of the stator against the slide in a direction tending to pressrtheslide against the apertures at the oppositel side of the periphery of the stator. Y

4. A siren adapted ,toemploy a liquid as the sound-producing medium, having a cylindricalrotor apertured to permit the How of liquid therethrough, and a cylindrical anV stator correspondingly apertured on'one side stator and having apertures adapted to reg-V ister with the rotor and stator apertures, and

means for shifting the slide to interrupt or` permit the tlow ot sounding liquid, whereby the pressure of the liquid in the siren acts through the pressure apfei-ture'in the slide in a direction tending to press the slide against the apertures at the opposite side of the periphery of the stator;

5. A siren adapted toemploy a liquid asA the sound-producing medium` comprising a hollow cylindergor drum having perforatioiis in itscircuinference andadapted to be rotated, in combination with a stationary cylinder surrounding the said rotor and being provided with soundapertures on one side of its circumference anda pressure aperture on the opposite side and a third cylinder surrounding the said stator and likewise provided with apertures 4on one side Vof its circumference said apertures 'corre sponding in size and position to the said sound apertures in the'statonsaid cylinder being adapted to be shifted circumferentially from a position in which its apertures register with the said sound apertures in the said stationary cylinder to a position in whichthe .said apertures register with full portions of the stator walls, and vice versa, and means forshifting the said slide cylindercircumferentially. f 1

In testimony vwhereoi:l I affix my signature, in presenceof two witnesses.

Dn.' HEINRICIIHECHT. Y Witnesses: I JULiUs LOPKE, HANS WEGNER.

`contesti" thispatent may be obtained for ve cents each, by addressing the Commissioner of l'atentt` Washington, .'D. C.

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